I don't really have the answer to that questions, but I'd assume the thing to do is start with a small amount like a teaspoon. When we got Sophie we mixed a little canned food with a little water and then stirred in 1 teaspoon of plain canned pumpkin (to keep the stool firm), and then stirred the dry kibble into the kind of soupy mixture. She still gets that every day just not much water now, I've not tried the yogurt, as she has had no allergies or problems like that, and she has never had a problem with diarreah either. Good luck with you new baby.